Shaft bearing for band-saw mills



Jan. 11, 1927. 1,614,421 G. E. CAMPBELL SHAFT BEARING FOR BAND SAW MILLS Filed May 1e, 1924 4 Sheets-Sheet l Jan. 11, 1927. 1,614,421 Y G. E. CAMPBELL SHAFT BEARING FOR BAND SAW MILLS Filed May 16, 1924 4 Sheets-Sheet 2 Jan. 11,1927. 1,614,421

G; E. CAMPBELL SHAFT BEARING FOR BAND4 SAW MILLS Filed May 16, 1924 4fSh'eetS-Sh9et 3 SHAFT BEARING FOR BAND SAW MILLS Filed'May 16. 1924 4 Sheets-Sheet 4 Patented Jan. '11, 1927.

narran stars s GEORGE E. CAMPBELL', OF CEATTANOOGA, TENNESSEE, ASSGNOR TO TFE WHELAND' (LOMPAB'IY, 0F CHATTANOOGA, TENNESSEE, A. CORPORATION TENNESSEE,

SHAFT BEARNG FOR BANDeS/V MILLS.

Application filed May 16, 1924. Serial No. 713,?07'.

My invention relates to an improvement in shaft bearings,.and more particularly for band-saw mills.

The object is to provide simple means for. taking up Wear and adjusting the bearing. Another object is to increase the durability as Well as the efficiency of the bearing. The invention includes a. sliding sleeve mounted in abox, which in turn is mounted on a trunnion, and the latter in turn being carried on a yoke, the base of which is mounted in a vertical column which permits rotation of' the yoke at right-angles to the rotation of the trunnion on the yoke.

The invention further includes a sliding sleeve in connection with a trunnion-pin which passes through the box., and prevents the sliding sleeve from being entirely removed from the box before this pin is` removed.

In the accompanying` dravvings:

Fig. lis aperspective viewi of the invention as appliedV tol a band-saw mill;

Figs-2Y and?) are sections at rightvangles to `each other through a hearing;

Fig. tlis aivieiv'of the sliding sleeve partly in section;

Fig. 5 is ak view. of. the4 sleeve at rightangles to Fig; 4;

Fig. 6 .isl av transverse sectionthrough the center,v of the sleeve; and

Fig. 7 is a side elevation of the adjusting collar. l

rlhe numeral 1 represents a yoke, the base of'vvh'ich is mounted in avertical column A, allowing rotation ofl the yoke in one direction. 2,` is` a bearing-box held in thel yoke by'trunnion shaft uponivhich the box is mounted and capable of turning on an axis at rightangles to that of the `vertical column A.; andthe. ends of the trunnon-shaft` are held in the yoke by nuts t screwed on its opposite ends as viewed in Fig. 3. A bandsaW Wheeleshaft is represented by the numeral 5. The end of the shaft extends through the box 2 as shown in Fig. 2. A sleeve 6 is slidably mounted Within the box, and interposed between the sleevel and the shaft, are the tapered roller bearings 7 preferably rollers, the cones 8 and the races 9. While these bearings as shown are of the tapering type of `roller, this is by no means necessary, and l do not care to be limited to any form of roller, or in fact a roller bearing at all, as ball-bearings might. be ein-V ployed. v

The sleeve has internal shoulders 10, and 11, and the shaft has a shoulder 12;. The inner set of bearings, including the race and cone, occupy the space bet-Ween theshoulder 10 on the sleeve andthe shoulder 12 onthe shaft, and the outer hearings between the shoulder 11 on the sleeve anda Washer or. roller 13 actuated to slide on the threaded end 14 of the shaft. the threaded end against the Washer or col.- lar for adjustingfthe bearingsand taking' up Wear. The nut and Washer at the ende 0f the shaft are for the purpose of adjusting the bearings longitudinally on the shaft. It is by this means that any Wear on the rollers or ball-bearings is taken up. W hen the nut is tightened against therend bearing, the ad# justment is transmitted to the inside bearing due to the fact that the steell sleeveV 6 is slidahly mounted inside ofthe box 1Y carry ing the same.

The collar or Washer lbetweenthe nut and the bearing is fitted with the dove-tail key 16 simply as a safety-deviee-to` prevent the nut from unscrewing should the bearing become loose onfthe shaft. rlhe-nut in turn is locked to theshaft after the adjustment is made by a Cotter-pin 17 passingentirely through the shaft and the end. of the nut. This affords a simple means for adjusting and taking up anyWear Whichmay occur in the bearings.

The sleeve 6 is reduced through the center as shown at 18 in Figs. 41- and 5, andsy-mmetrical notches 19 are cut through at opposite sides of the center of thef sleeve as shown in Figs. 3 and 6. This is done because all of the Wear in the cups of tapered roller-bearings comes on the bottom of: the cups or races, and very little Wear comes on the top. By removing the trunnion pinf or shaft 3, the sleeve 6 may be given a half turn in the box, and the life of the'bearing may, in that Way, be doubled. In other Words, the position of thesleeve is reversed', the bottom half being turned to the top, and the top to the bottom, simply by giving the sleeve a half revolution.

. The trunnionpin 3 also performs the function of preventing the sleeve 6 from rotating. As explained, the sleeve 6 itself has a sliding fit in the box After the nut A nut is screvvedon f 15 on the end of the shaft is adjusted, and the bearings are properly fitted and tightened, the last thing' to be done is to lock the sleeve 6 by tightening the two set-sere vs 2() (see Fig. 3). This is done in order to prevent any thrust which may come upon the shaft from pushing the sleeve entirely through the box. In the event that these Set-screws should work loose, the entire end movement of the shaft would be blocked as soon as it came in contact with the trunnion pin or shaft 3 which passes through the box 2 and the lower notch 19 of the sleeve.

A cap 22 is secured over the end of the shaft, as shown in Figs. l. and 2.

On the band saw-mill illustrated in Fig. 1, there are four of these yolres and bearingl boxes 2, 4all of which are exactly alike. ln order to keep the saw 23 running on the wheels, it is necessary to raise one or the other of the top boxes on each end of the shaft which carries the upper wheel 2st. This is accomplished by means (not shown) whereby the shaft is tilted to leep the saw on the wheel. Sometimes it is necessary to raise one box 2 as much as an inch higher than the other box and in order to prevent the bearings from binding on the shaft the trunnion-pin or shaft 3 is employed. The boxes 2 freely hinge on these trunnions so that no binding is possible. It is understood that one of these trunnion pins or shafts runs entirely through each box. When one box is raised higher than its fellow, there would necessarily be a trifle more distance from center to center of the boxes than there would be when the shaft is perfectly level. So again, in order to prevent the bearings from cramping, recourse is had to the sliding sleeve 6.

This sleeve is slidably fitted in the box, and by the use of this sleeve it is impossible to load one bearing heavier than the other. Thus when it is necessary to adjust these bearings to take up the wear, the nut on each end of the shaft is all that/has to be adjusted. This end forces the bearings in each box together until just the proper rotating clearance is provided. that as the nut is tightened, the outside antifriction bearings will first become tight between cone and race, but, due to the slidability of the sleeve 6, if the inner bearing should be loose between its cone and race, the sleeve 6 will cause an equalization of pressure, with the result that there is always the same clearance for both sets of anti-friction bearings due to the sliding tit of the sleeve. In other words, when the nut on the end of the shaft is tightened, thesingle nut adjusts both bearings with one nut adjustment, precisely as though a single bearing were being adjusted. This is a great advantage to the mill-man who is not It will be noticed always familiar with this type of bearing installation.

By the use of the nut at each end of the shaft, the sleeve in one box is held fast by the two set-screws 20, so that all thrust on this shaft is carried on' one box, while the sleeve in the other box may do all the sliding for both bearings.

After the sleeves are in place, the trunnion-shaft or pin 8 is then put in. This trunnion-shaft or pin not only acts as a pivot on which the box can freely oscillate, but it also holds the sleeve in the box, that is, it prevents the sleeve from rotating, and, should the set-screws become loose for-any cause, the trunnion prevents the sleeves from moving endwise to any great extent, as with slight movement they would come in contact with the trunnions and be prevented from moving further. ln this way the trunnion shaft or pin acts really as a safeguard against accident.

l claim:

l. The combination of a casing, a support for said casing, and a trunnion pin extending through the casing and into the support, for pivotally connecting the support and casing together, and .for limiting the movement of the sleeve.

2. The combination of a casing, a sleeve mounted therein, and having a notched side, a shaft mounted in said casing, a support for the casing, and a trunnion pin extending through the casing and the notch in the sleeve and into the support, for pivotally connecting the support and casing together and for limiting the movement of the sleeve.

3. The combination of a casing, a longitudinally movable sleeve mounted therein and having ay notched side, a shaft mounted in said sleeve, bearings interposed between the shaft and sleeve, a support for the casing and a trunnion pin extending through the casing and the notch in the sleeve and into the support at its opposite ends, for pivotally connecting said support and casing together and for limiting the longtudinal movement of the sleeve.

41. The combination of a casing, a sleeve mounted therein and having notches formed in the opposite sides thereof, a support for the casing, and a trunnion pin extending through the casing and at least one of the notches in the sleeve and into the support for pivotally connecting` the support and casing together and for limiting substantial movement of the sleeve.

5. The combination of a'shaft, a yoke, a box, a sleeve in the box and having a notched side, and a trunnion pin extending into the yoke and through the box, pivotally connecting them together, and through the notch in the sleeve to prevent substantial movement thereof.

iii

6. The combinaion of a yoke, a casing, a trunnion pin pivotally supporting the casing in the yoke, and a sleeve mounted in said casing and having a notch therein, said trunnion pin extending into the notch to prevent substantial movement of the sleeve.

7. The combination of a yoke, a casing, a trunnion pin pivotally supporting the casing in the yoke, a sleeve mounted in said casing, and having a notch therein, said trunnion pin extending into the notch to prevent substantial movement of the sleeve, a shaft mounted in the sleeve, and bearings interposed between the shaft and sleeve.

8. The combination of a easing, a sleeve mounted therein and having a notch formed in the side thereof, aY shaft mounted in said sleeve, a. support for the casing, and a. trunnion pin extending through the casing and notch in the sleeve and into the support at its opposite ends, for pivotally connecting the support and casing together and .for limiting the longitudinal and ro` tary movement of the sleeve.

9. rlhe combination of a support, a casing, a sleeve mounted in the casing and having notches formed in diametrically opposite sides thereof, a shaft mounted in the sleeve, bearings interposed between the shaft and sleeve, and a trunnion pin extending into at least one of the notches to prevent substantial movement of the sleeve.

10. The combination of a support, a casing, a sleeve movably mounted in the casing and having notches formed in diametrically opposite sides thereof, a shaft mounted in the sleeve, roller bearings interposed between the shaft and sleeve, and a trunnion pin removably extending into one of the notches to prevent substantial rotary movement of the sleeve and to permit thev sleeve to be reversed upon removal thereof.

11. The combination of a support, a Acasing, a sleeve movably mounted in the easing and having notches formed in diametrically opposite sides thereof, a shaft mounted in the sleeve, roller bearings interposed between the shaft and sleeve, and a trunnion pin removably extending through the casing and one of the notches in the sleeve and into the support to prevent substantial longitudinal and turning movement of the sleeve and to permit the sleeve to be reversed diametrically upon removal of the 1Q. The combination of a shaft, a yoke, a box, a slidable sleeve, bearings between the sleeve and shaft, the sleeve having a notched side, and a trunnion pin or bolt extending through the yoke and box andpivotally connectingthem together and through the notch in the sleeve, whereby to prevent the latter from turning and limit its endwise movement.

13. The combination of a shaft, a yoke, a box, a slidable sleeve, bearings between the sleeve and shaft, the sleeve having a notched side, a trunnion pin or bolt extending through the yoke and box and pivotally connecting them together and through the notch in the sleevg, whereby to prevent the latter from turning and limit its endwise movement, and" set-screws for locking the sleeve in the box.

14. The combination with a yoke, a box, a notched sleeve sliding in the box, a trunnion extending through the box, a notch in the sleeve and into the yoke for pivotally connecting the box and yoke and limiting the movement of the sleeve within the box in two directions.

15. The combination with a yoke mounted and capable of turning on a vertical eolumn, a box, a notched sleeve sliding in the box, a trunnion extending through the box, a notch in the sleeve and into the yoke for pivotally connecting the box and yoke and limiting the movement of the sleeve within the box in two directions.

16. The combination with a yoke, a box, a notched sleeve sliding in the box, a trunnion extending through the box, a notch in the sleeve and into the yoke for pivotally connecting the box and yoke and limiting the movement of the sleeve within the box in two directions, and means for taking up the wear in the bearings by moving the sleeve endwise, and means for locking the sleeve in the box.

17. The combination of a yoke, a casing, a sleeve movable in the casing and having a notch in the side thereof, 'a trunnion pin extending through the casing and notch in the sleeve and into the yoke for pivotally connecting te casing and yoke together and for limiting the movement of the sleeve, said sleeve having shoulders therein adjacent the outer ends thereof, a shaft mounted in the sleeve, and bearings interposed between the shaft and the shoulders in the sleeve.

18. The combination of a yoke, a casing,

a sleeve movable in the casing and havingV a note-h in the side thereof, a trunnion pin extending through the casing and notch in the sleeve and into the yoke for pivotally supporting the casing in the yoke and for limiting the movement of the sleeve, said sleeve having shoulders therein adjacent the outer ends thereof, a shaft mounted in the sleeve, having a shoulder formed thereon and having a threaded outer end, an adjusting nut screwed onto said threaded end, and roller bearings interposed between the shoulders in the sleeve and the shoulder and adjusting nut on the shaft.

In testimony whereof I allix my signature.

GEORGE E. CAMPBELL. 

